Coral Reefs

, Volume 32, Issue 1, pp 305–314

Ocean acidification does not affect the physiology of the tropical coral Acropora digitifera during a 5-week experiment

Report

Abstract

The increase in atmospheric CO2 concentration, which has resulted from the burning of fossil fuels, is being absorbed by the oceans and is causing ocean acidification. Ocean acidification involves the decrease of both the pH and the calcium carbonate saturation state. Ocean acidification is predicted to impact the physiology of marine organisms and reduce the calcification rates of corals. In the present study, we measured the rates of calcification, respiration, photosynthesis, and zooxanthellae density of the tropical coral Acropora digitifera under near-natural summertime temperature and sunlight for a 5-week period. We found that these key physiological parameters were not affected by both mid-CO2 (pCO2 = 744 ± 38, pH = 7.97 ± 0.02, Ωarag = 2.6 ± 0.1) and high-CO2 conditions (pCO2 = 2,142 ± 205, pH = 7.56 ± 0.04, Ωarag = 1.1 ± 0.2) throughout the 35 days experimental period. Additionally, there was no significant correlation between calcification rate and seawater aragonite saturation (Ωarag). These results suggest that the impacts of ocean acidification on corals physiology may be more complex than have been previously proposed.

Keywords

Ocean acidification Coral Calcification Photosynthesis 

Supplementary material

338_2012_979_MOESM1_ESM.doc (9.4 mb)
Supplementary material 1 (DOC 9585 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Graduate School of Engineering and ScienceUniversity of the RyukyusNishiharaJapan
  2. 2.Transdisciplinary Research Organization for Subtropical Island StudiesUniversity of the RyukyusNishiharaJapan

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